Transcription of Electron Diffraction and Crystal Structure
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Electron Diffraction and Crystal Structure
University of Michigan Physics 441-442 2/9/06 Advanced Physics Laboratory Electron Diffraction and Crystal Structure 1. Introduction In classical mechanics we describe motion by assigning momenta to point particles. In quantum mechanics we learn that the motion of particles is also described by waves, with the crucial parameters of the two viewpoints related through the de Broglie relation: !=hp [1] where p is the momentum, is the wavelength, and h is Planck s constant h= !10"34J#s= !10"15eV#s. To observe wave-like behavior, we require some kind of grating where the distance between slits is of order the wavelength.
Electron Diffraction and Crystal Structure 1. Introduction ... The sum of the reflections from a large number of parallel mirrors all separated by the same distance, d, will produce strong diffraction peaks when the angle between the beam and surface satisfies the Bragg condition
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